/*  超出显示... */
@mixin ellipsis($w:auto) {
  width: $w;
  overflow: hidden;
  -o-text-overflow: ellipsis;
  text-overflow: ellipsis;
  white-space: nowrap;
  word-wrap: normal;
}
/*多行文本溢出*/
@mixin ellipsisLn($line) {
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: $line;
  -webkit-box-orient: vertical;
}